Drop hammer



April 10, 1934. .1. c. WATTLEWORTH DROP HAMMER Filed Sept. 21. 1931 5Sheets-Sheet l m v I Z2 cmmwm i g Q3 a6 W; 0 H MAJ/WIN 5% 6 W a 4 4 x t%5 M g j 3 2 a Z y W W m1 4 r70 P 0, 1934. J. c. WATTLEWORTH 1,954,159

DROP HAMMER Filed Sept. 21, 1931 3 Sheets-Sheet 2 7 John. Q. 6Wattlzwortk y INVENTOR April 10, 1934- J. c. WATTLEWORTH 1,954,159

DROP HAMMER Filed Sept. 21. 1931 3 Sheets-Sheet 3 V, 3 John;Q\Watt1worth INVENTOR 'ATTORNEDW' Patented Apr. 10, 1934 UNITED STATESPATENT; OFFICE DROP HAMMER a corporation of Ohio Application September21, 1931, Serial No. 564,013

9 Claims.

This invention relates to drop hammers and has for an object theprovision of a new and improved apparatus of this type.

In the drawings accompanying this specification and forming a part ofthis application I have shown, for purposes of illustration, one formwhich my invention may assume, and in these drawings:

Figure 1 is a front elevational view of an embodiment of the invention,

Figure 2 is a fragmentary rear elevational view of said embodiment,

Figure 3 is an enlarged horizontal sectional view corresponding to line3--3 of Figure 1,

Figure 4 is an enlarged vertical sectional view corresponding to theline 4-4 of Figure 1,

Figure 5 is an enlarged horizontal sectional view correspondingsubstantially to the line 5--5 of Figure 1,

Figure 6 is an enlarged horizontal sectional view correspondingsubstantially to line 66 of Figure 1, while Figure 7 is an enlargedvertical sectional view corresponding substantially to line 7-7 ofFigure 6.

The embodiment of the invention illustrated in the drawings comprises abase support 20 which may be sunk a suitable distance into the floor toprovide a firm anchorage therefor, and the base 20 is provided with aplatform 21 for the accommodation of a die support 22 carrying a die 23.Secured to theupper surface of the base support 20 and reaching upwardlytherefrom to a connecting head 24 are spaced standards 25, each 33 ofwhich is substantially T-shaped in cross section, with the stems 26disposed inwardly and providing projections 27 receivable in guidegrooves 28 formed in a hammer head 29. At its lower end the hammer head29 carries a die supporting portion 30 provided with a groove for thereception of a die 31 adapted to cooperate with the die 23. At its upperend the hammer head 29 has attached thereto a plurality of boards 32,

each square or diamond-shaped in cross section to provide V-shapedcontours along the ends of which are supported by means of antifrictionbearings 37, eccentrically carried by cylindrical bearing members 38forming a part of the connected housing members 40, and rotatablyjournaled in bearing supports 41, and the shaft 36 has a pulley 42adapted to be driven by a suitable motor not shown; the roll 34 isfixedly secured to the shaft 43, supported in antifriction bearings 44,eccentrically carried in cylindrical bearing members 45 forming part ofthe connected housing members 46 and the bearing members 45 arerotatably journaled in supports 47 carried by the head 24, and the shaft43 has a pulley 48 secured thereto adapted to be driven by a suitablemotor.

One of the connected housing members 46 is provided with a pair of ears49 for the reception of one end of a rod 50 pivotally held between theears by a pin 51, and the rod 50 has its opposite end extended through alug 52 mounted on one of the standards and is adjustably afiixed to saidlug by adjusting nuts 53 flanking said lug, this construction permittingadjustment of the position of the roller 34.

The connected housing members 40 are also provided with spaced ears 54between which extends one end of a lever 55, pivotally held between thecars 54, by a pin 56, and the lever 55 is inclined laterally andpivotally connected by a pin 57 to the upper end of an elongated gravityinfluenced member 58, reciprocably mounted adjacent its up per end in aguide bracket 59, and at its lower end in a socket 60 on one of thestandards 25. The weight of the member 58 acting through the lever 55rotates the bearing members 38, and by reason of the eccentric mountingof the shaft 36 in said bearings, the roll 33 is maintained in tightengagement with the tailpieces 32; upward movement of the weightedmember 53, moves the lever 55, and the housing members 40, and bearings38 in a clockwise direction which results in the roll 33 moving awayfrom the tailpieces 32, thereby releasing the tailpieces 32 andpermitting the hammer head 29 to drop.

Means are provided for lifting the weighted member 58 through movementof the hammer head 29, and such means comprise an arm 61 pivotallysecured as at 62 to a plate 63, supported by headed bolts adjustablysecured in a slot 64 formed in the standard 25, and the arm 61 isprovided with a slot 65 accommodating a block 66 pivotally carried by abracket 167 rigidly aifixed to the weighted member 58, and the outer endof the lever 61 is provided with a cam shoe 67 engageable with a cam 68formed on the hammer head 29, the cams 6'7 and 68 being of suchconfiguration that upward movement of the hammer brings about a relativeslow swinging movement of the arm 61 at less speed than the speed ofelevation of the hammer head, causing movement of the roll 33 away fromthe tailpiece 32 and releasing said tailpieces, this constructionserving to efiect a gradual release, and thereby doing away with theshock which occurs in ordinary constructions when the rolls are actuatedto release the hammer head. Below the cam 68 the hammer head 29 has aflat portion 168 with which the cam surface 67 of the lever 61 comesinto contact when the hammer head 29 overthrows upon its upward strokeas usually occurs, thereby limiting upward movement of the arm 61 andconsequently of the weighted member 58, so that the distance ofelevation of the weighted member 58 can be exactly regulated regardlessof upward overthrow of the hammer head 29.

Means are also provided for retarding the descent of the weighted member58, thereby bringing about a cushioned or gradual engagement of therolls 33 and 34 with the tailpieces 32. Such means comprises areciprocating cam member 69, having a cam surface 70, adapted to beengaged by a roller '71, carried by a bracket 72 fixedly secured to theweighted member 58. The cam member 69 is slidably mounted in guidebrackets '73 and '74, and at its outer end is connected by a cross head'75 with a reciprocating plunger 76, reciprocably mounted in bearings'77, forming part of the adjacent standard 25, and the outer end of theplunger '76 is adapted to be engaged by the rounded surface 177 of abracket 78 carried by a swinging member '79, pivotally connected, as at80, to the adjacent standard 25, and the swinging member 79 has its freeend bail-shaped as shown at 81, operating in a bearing 82 carried by arod 83, reciprocably mounted in bearings 84, and a spring 185 isinterposed between the bearing 82 and the adjacent bearing 84, saidspring normally urging the free end of the swingin member 79 inwardly,and the swinging member 79 carries a bracket 85, having a cam surface 86adapted to be engaged by a surface 87 on the hammer head 29. Pivotallyconnected, as at 88, to the reciprocating cam member 69 is one arm of abell crank lever 89 pivotally carried, as at 90, by the adjacentstandard 25, having its other arm provided with furcations 91 which aredisposed upon opposite sides of the member 58 and bear upon a collar 92slidably mounted upon the weighted member 58, and yieldably supported bya spring 93 interposed between the collar 92 and the bracket 72.

Eccentrically mounted clamps 94 are carried by the head 24, one of saidclamps being adjustably secured in position by an adjustable rod 95, ina manner well known in the art, while the other clamp 94 is movablethrough manipulation of the lever 96 and rod 97, these clamps whenclosed serving to engage the tailpieces 32 and arrest the hammer inelevated position.

In operation, the gravity influenced member 58, through its action uponthe lever 55, holds the roll 33 in such position as to be in contactwith the tailpieces 32 and also press such tailpieces into closeengagement with the roll 34,

I and these rolls when rotated in opposite directions elevate the hammerhead. As the hammer head approaches the limit of its upward movement thecam 68 thereof comes into engagement with the cam shoe 6'? of the arm61, moving the arm 61 in a clockwise direction, and this movementthrough the sliding connection of the arm with the weighted member 58,elevates the member 58 a predetermined distance only as governed by thelength of the cam surfaces 67 and 68, for as soon as the cam 67 comesinto contact with the fiat portion 168, elevation of the weighted member58 ceases, and the weighted member 58 is so disposed as to present theroller 71 in such position as to immediately engage the cam surface '70without jar, when the weighted member 58 descends. This upward movementof the weighted member 58 through the lever transmits movement to thehousing members 49 and bearing members 38, causing separation of theroll 33 with respect to the tailpieces 32 and roll 34, therebypermitting the hammer head 29 to drop, releasing the arm 61 and weightedmember 58.

As the hammer head 29 descends and approaches the limit of its downwardmovement, the portion 8'7 of the hammer head strikes the cam 86 of thebracket member 85, swinging the member 79 in an outward direction, andagainst the influence of the spring 185, thus causing outward movementof the rounded surface of the bracket 78 and outward movement of theplunger 76, which through its connection by the cross head 75, with thecam member 69, begins to pull the cam member 69 outwardly. The weightedmember 58 having been released by reason of the arm 61 moving out ofengagement with the hammer head 29, the weighted member 58 drops, andmovement of the cam member 89 is so timed that as its movement beginsthe roller '71 carried by the weighted member 58 rolls down the camsurface 70 as it is gradually being retracted, this action serving toretard the descent of the weighted member 58, and to effect a gradualreengagement of the roll 33 with the tailpieces 32.

By provision of the construction above described the engagement of therolls with the tailpieces is gradually effected, doing away with thesudden reengagement which occurs in connection with hammers employingweighted members to maintain the rolls in engagement, thereby providinga cushioned or retarded descent for the weighted member 58, resulting inlonger life of the tailpieces and smoother operation of the hammerwithout the shock and jar heretofore considered unavoidable. Shock isalso eliminated upon the ascent of the hammer, since lifting of theweighted member 58 is accomplished through the inclined surfaces of thecams 6'7 and 68, causing gradual elevation of the weighted member at aspeed less than the speed of the hammer head, and furthermore theweighted member 58 cannot be lifted beyond a predetermined position dueto the provision of the fiat portion 168 on the hammer head 29, assuringsmooth engagement between the roller 71 and the cam surface 70, eventhough the hammer head 29 overthrows some- 1 what on its upward stroke.

It will be understood by those skilled in the art that the embodimentherein described accomplishes at least the principal object of theinvention; and it will be further understood that said gageable withsaid tailpiece, one of said rolls being eccentrically mounted andmovable toward and from the other roll, and having a lever connectedwith said eccentric mounting for operating said movable roll; a frontrod member connected to said lever and under the influence of gravityoperable to cause engagement of said rolls; means engageable by saidhammer during its movement for elevating and releasing said front rodmember; cam means movable across the path of descent of said front rodmember; and means, operable through engagement by said hammer, forpositively moving said cam; said cam presenting a contour operable toretard the descent of said front rod member and effect gradualengagement of said rolls.

2. A drop hammer machine, comprising: a reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting for operating saidmovable roll; a front rod member connected to said lever and operableunder the influence of gravity to cause engagement of said rolls; meansengageable by said hammer during its movement for elevating andreleasing said front rod member; cam means movable across the path ofdescent of said front rod member; mechanism comprising a lever pivotedat one end to said machine and having a cam member engageable by saidhammer and operable upon such engagement to cause swinging movement ofsaid lever about said pivot; and a connection between said lever andsaid cam means for positively moving said cam means; said cam meanspresenting a contour operable to retard the descent of said front rodmember.

3. A drop hammer machine, comprising: a reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting for operating saidmovable roll; a front rod member connected to said lever and under theinfluence of gravity operable to cause engagement of said rolls; meansengageable by said hammer during its movement for elevating andreleasing said front rod member; means on said front rod member carryinga rotatably mounted roller; cam means moving across the path of descentof said front rod member; and means for positively moving said cam, saidcam presenting a contour cooperable with said roller to retard thedescent of said front rod member and effect gradual engagement of saidrolls.

4. A drop hammer machine, comprising: a reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting for operating saidmovable roll; a front rod member connected to said lever and under theinfluence of gravity operable to cause engagement of said rolls; meansengageable by said hammer during its movement for elevating andreleasing said front rod member; cam means moving across the path ofdescent of said front rod member; means for positively moving said camin one direction during descent of said front rod member; said campresenting a contour operable to retard the descent of said front rodmember and effect gradual engagement of said rolls; an operableconnection between said cam and said front rod member for moving saidcam in an opposite direction when said front rod member is elevated; andcushioning means interposed in said operable connection.

5. A drop hammer machine, comprising: a re ciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting for operating saidmovable roll; a front rod member connected to said lever and operableunder the influence of gravity to cause engagement of said rolls; meansengageable by said hammer during its movement for elevating andreleasing said front rod member; cam means movable across the path ofdescent of said front rod member; means for positively moving said cammeans in one direction during descent of said front rod member; said cammeans presenting a contour operable to retard the descent of said frontrod member; and connecting means comprising a bell crank lever pivotedat its elbow, and having one arm in operative engagement with said frontrod member, and the other arm connected to said cam means, for movingsaid cam means in the opposite direction upon elevation of said frontrod member.

6. A drop hammer machine, comprising: a reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting for operating saidmovable roll; a front rod member connected to said lever and operableunder the influence of gravity to cause engagement of said rolls; meansengageable by said hammer during its movement for elevating andreleasing said front rod member; cam means movable across the path ofdescent of said front rod member; mechanism comprising a lever pivotedat one end to said machine and having a cam member engageable by saidhammer and operable upon such engagement to cause swinging movement ofsaid lever about said pivot; a connection between said lever and saidcam means for positively moving said cam means in one direction; saidcam means presenting a contour operable to retard the descent of saidfront rod member when moved by said connection; and connecting meanscomprising a bell crank lever pivoted at its elbow, and having one armin operative engagement with said front rod member and the other armconnected to said cam means, for moving said cam means in the oppositedirection upon elevation of said front rod member.

'7. A drop hammer machine, comprising: a reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting for operating saidmovable roll; a front rod member connected to said lever and operableunder the influence of gravity to cause engagement of said rolls; meansengageable by said hammer during its movement for elevating andreleasing said front rod member; cam means movable across the path ofdescent of said front rod member;

mechanism comprising a lever pivoted at one end said cam means in onedirection to retard descent of said. front rod member; and connectingmeans comprising a bell crank lever pivoted at its elbow, and having onearm in operative engagement with said front rod member, and the otherarm connected to said cam means, for moving said cam means in theopposite direction upon elevation of said front rod member.

8. A drop hammer machine, comprising: a'reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beingeccentrically mounted and movable toward and from the other roll, andhaving a lever connected with said eccentric mounting foroperating saidmovable roll; a front rod member connected to said lever and operableunder the influence of gravity to cause engagement of said rolls; alever pivotally mounted on said machine, movably connected with saidfront rod member intermediate its ends, and having a cam surfaceengageable with a cam surface on said hammer, said cam surfaces beingproportioned to effect elevation of said front rod member the samedistance upon each movement thereof; cam means movable across the pathof descent of said front rod member; means for positively moving saidcam means; said cam means presenting a contour 'ber,

proportioned to the cam surfaces of said lever and said hammer and tothe distance of movement of said front rod member, and operable toretard the descent of said front rod member.

9. A drop hammer machine, comprising: a reciprocable hammer having atailpiece; rolls engageable with said tailpiece, one of said rolls beuing eccentrically mounted and movable toward and from the other roll,and having a lever connected With said eccentric mounting for operatingsaid movable roll; a front rod member connected to said lever and underthe influence of gravity operable to cause engagement of said rolls;means engageable by said hammer during its movement for elevating andreleasing said front rod member; cam means moving across the pathofdescent of said front rod member; means for'positively moving said camin one direction duringdescent of said front rod member; saidcam'presenting a contour operable to retard the descent of said frontrod member and eifect gradual engagement of said rolls; and an operableconnection between said cam and said front rod member for moving saidcam in an opposite direction'upon elevation of said front rod mema i i1%; JOHN C. WATTLEWORTH.

